| 摘要 |
<p>PURPOSE:To improve the durability of a sensing line by providing a longitudinal groove on a resin conduit for containing a cable, and engaging and holding an optically sensing line therein. CONSTITUTION:At least one longitudinal groove 7 is formed on a resin conduit 1, the groove 7 is opened in or out of the conduit, and an optically sensing line is engaged and held in the groove 7. Accordingly, the sensing line is completely held by the wall 7 of the conduit 1 and, even if its part is brought into contact with the cable, it is substantially isolated from the cable containing space of the conduit 1. When the groove 7 is open in the conduit 1, the sensing line engaged within the groove 7 can rapidly react with invasion of water or heat generation in the conduit 7. When the groove 7 is open out of the conduit, the state out of the conduit can be identified. Thus, the durability of the sensing line can be improved.</p> |
